[1] Natl Hlth Operat Ctr, Hellen Ctr Dis Control & Prevent, Athens, Greece
[2] Ist Nazl Malattie Infett Lazzaro Spallanzani, I-00149 Rome, Italy
[3] Royal Free Hosp, Dept Infect Dis, London NW3 2QG, England
[4] Goethe Univ Frankfurt, Univ Hosp, Dept Infect Dis, Frankfurt, Germany
[5] CHU Nord AP HM, Dept Clin Microbiol & Infect & Trop Dis, Marseille, France
[6] Linkoping Univ Hosp, Fac Hlth Sci, S-58185 Linkoping, Sweden
[7] Univ Copenhagen, Herlev Hosp, DK-2730 Herlev, Denmark
[8] Off Publ Hlth, Frankfurt, Germany
[9] Ctr Hosp, Luxembourg, Luxembourg
[10] Univ Utrecht, Med Ctr, Utrecht, Netherlands
[11] Natl Publ Hlth Inst, Tallinn, Estonia
[12] Natl Publ Hlth Inst, Dept Infect Dis, Helsinki, Finland
[13] Hellen Ctr Dis Control & Prevent, Dept Intervent Hlth Care Facil, Athens, Greece
[14] Hosp Egas Moniz, Ctr Hosp Lisboa Ocidental, Lisbona, Portugal
[15] Hosp Univ Vall Hebron, Barcelona, Spain
[16] W Tallinn Cent Hosp, Tallinn, Estonia
[17] Ghent Univ Hosp, B-9000 Ghent, Belgium
[18] Hop Raymond Poincare, Unite Malad Infect, AP HP, Garches, France
[19] Mater Misericordiae Univ Hosp, Dept Med Therapeut & Infect Dis, Dublin 7, Ireland
[20] Aurora Hosp, Helsinki Univ Cent Hosp, SF-00250 Helsinki, Finland
[21] State Hosp, Rigshosp, Epidemiklinikken, Copenhagen, Denmark
[22] Univ Barcelona, Dept Epidemiol & Prevent Med, Hosp Clin, Barcelona, Spain
[23] Otto Wagner Spital, Vienna, Austria